Co-op and condo owners, whose property-tax bills often resemble an advanced-calculus exam, can look forward to a cheat sheet in the coming months.

The City Council plans to fast-track a bill that will require the Bloomberg administration to offer detailed explanations about why some property-tax bills increase while home values drop, and why market and assessed values differ so drastically.

The city’s Department of Finance would have to detail what goes into the calculations — including comparisons with neighboring properties — when it determines the assessed value of co-ops and condos.

“A lot of the confusion and frustration around property tax bills will be lessened for tens of thousands of taxpayers citywide,” said Council Speaker Christine Quinn.